In the "PSoC® 4: PSoC 4200L Datasheet", on the bottom of page 12 it reads:
"Balls C6, D11, H11, H3, L4, and L5 are No Connects (NC) on the 124-BGA package. Pins 11 and 15 are NC on the 48-TQFP packages."
Does anybody know if these pins are not internally connected or that they are connected (for another purpose) and I should leave them unconnected?
I have no device at hand, otherwise I would have measured it.
I find it good design practice to connect all pins that are not internally connected to GND on the PCB.
Tying these pins to GND allows for a better spread of GND on the PCB. Besides, as a former Philips employee, I was drilled to not have any floating copper on a PCB.
Casper van Doorne
Doofenshmirtz Evil Inc.
NC means no internal connection, it is not for other purpose. Just leave these pins float is fine when design hardware.